package cn.zhy.org.service.impl;

import cn.zhy.basic.service.impl.BaseServiceImpl;
import cn.zhy.basic.util.PageList;
import cn.zhy.org.domain.Department;
import cn.zhy.org.mapper.DepartmentMapper;
import cn.zhy.org.query.DepartmentQuery;
import cn.zhy.org.service.IDepartmentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Service
@Transactional(readOnly = true,propagation = Propagation.SUPPORTS)
public class DepartmentServiceImpl extends BaseServiceImpl<Department> implements IDepartmentService {

    @Autowired
    private DepartmentMapper departmentMapper;

    @Transactional
    @Override
    public void save(Department department) {

        departmentMapper.save(department);

        String dirPath = "";
        if (department.getParent_id() ==null){
            Long id = department.getId();
            //拼接
            dirPath = "/"+id;
        }else {
            //获取上级部门
            Long parent_id = department.getParent_id();
            //获取上级部门dirpath
            String parentDirPath = departmentMapper.loadById(parent_id).getDirPath();
            dirPath = parentDirPath + "/" + department.getId();
        }
            //设置新的dirpath
        department.setDirPath(dirPath);
        departmentMapper.update(department);

    }

    @Transactional
    @Override
    public void update(Department department) {


        String dirPath = "";
        if (department.getParent_id() ==null){
            Long id = department.getId();
            //拼接
            dirPath = "/"+id;
        }else {
            //获取上级部门
            Long parent_id = department.getParent_id();
            //获取上级部门dirpath
            String parentDirPath = departmentMapper.loadById(parent_id).getDirPath();
            dirPath = parentDirPath + "/" + department.getId();
        }
        //设置新的dirpath
        department.setDirPath(dirPath);
        departmentMapper.update(department);
    }


    @Override
    public List<Department> deptTree() {
        // 1. 一次性查询出所有数据，放到内存中，可以使用map
        // 2. 从所有数据中找出第一层级/顶级部门：这就是我们需要返回的数据
        // 3. 遍历所有部门只要不是第一层级的，找自己的上级，并将自己放入上级的children中
        //将所有的部门撞到map中  - 每次获取父部门都从这里获取
        List<Department> all = departmentMapper.loadAll();
        Map<Long,Department> map  = new HashMap<>();
        for (Department department : all) {
            map.put(department.getId(),department);
        }

        //前端需要得到的集合数据 - 部门树
        List<Department> deptTree = new ArrayList<>();
        for (Department department:all){
            if(department.getParent_id() == null){//顶级部门
                deptTree.add(department);
            }else{//不是顶级部门
                //1.想办法找到当前部门的 父部门
                Long parent_id = department.getParent_id();
                //这种从数据库查询的方式，每次通过id去查询 - 查询出来映射给实体domain，children集合中都会是空集合 - 没有任何数据
                //Department parentDepartment = departmentMapper.loadById(parent_id);
                //下面这种是从Map中去获取的 - 以前装进去的对象还是会存在
                Department parentDepartment = map.get(parent_id);
                //2.将自己装到  父部门 的children中
                parentDepartment.getChildren().add(department);
            }
        }
        return deptTree;
    }


}
